I made a package for LiveSplit that will allow you to compare against your own personal best and the world record run by Gymnast86. You will have to use universal hotkeys since this requires two instances of LiveSplit to be open at the same time. Universal hotkeys will ensure that these are on sync. I got accurate splits from playing Gymnast's run frame by frame. There may be some splits you don't use, so just delete them.

"Reference" Split is something Gymnast used to track the timer for wrong warps and day 0 execution. These are the same and are split at the moment you see the digital button dimming from being pressed. (Gymnast perfectly split these too. Amazing.) Enter Stone Tower is split by when the loading icon disappears when entering Stone Tower Temple (re-entering, not entering from WW).

I will always be ready to update these if a new world record is set. And, if you split differently, let me know so I can make accurate splits for you.

Livesplit has a built in feature to compare against multiple runs. You go to edit splits and add a comparison. You can switch between all of your comparisons at any time in a run.

That doesn't seem to give me a way to see both comparisons at the same time without a keystroke to switch between the two. In fact, I don't think that even compares against two different sets of splits. I simply didn't see a way to do anything like that. Putting both up in two different instances is easier.